Any suggestions regarding fireproof safes?

I've decided that I need a fireproof safe that will allow me to keep a few important documents inside, as well as one or two 3.5" HDDs. I'd like the safe to be as small as possible as well because I want to place it inside my closet.

Are there huge differences regarding different models/manufacturers when it comes to storing electronic devices inside? Anything else I should be aware of?

What safes would you recommend? What are your solutions at home?